问答题
【参考答案】
People in ancient times had to send extremely urgent letters......
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单项选择题
The application of the novelty theory is NOT affected by
A.brain’s reward system.
B.brain chemicals.
C.a couple’s present relationship.
D.the means of experiments.
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单项选择题
Sometimes parents buy the best thing in all the labels because it is about
A.price.
B.quality.
C.status.
D.safety.
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